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Johannes Berg2a519312009-02-10 21:25:55 +01001/*
2 * cfg80211 scan result handling
3 *
4 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
Johannes Berg2740f0c2014-09-03 15:24:58 +03005 * Copyright 2013-2014 Intel Mobile Communications GmbH
Avraham Stern1d762502016-07-05 17:10:13 +03006 * Copyright 2016 Intel Deutschland GmbH
Johannes Berg2a519312009-02-10 21:25:55 +01007 */
8#include <linux/kernel.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09009#include <linux/slab.h>
Johannes Berg2a519312009-02-10 21:25:55 +010010#include <linux/module.h>
11#include <linux/netdevice.h>
12#include <linux/wireless.h>
13#include <linux/nl80211.h>
14#include <linux/etherdevice.h>
15#include <net/arp.h>
16#include <net/cfg80211.h>
Johannes Berg262eb9b22011-07-13 10:39:09 +020017#include <net/cfg80211-wext.h>
Johannes Berg2a519312009-02-10 21:25:55 +010018#include <net/iw_handler.h>
19#include "core.h"
20#include "nl80211.h"
Johannes Berga9a11622009-07-27 12:01:53 +020021#include "wext-compat.h"
Hila Gonene35e4d22012-06-27 17:19:42 +030022#include "rdev-ops.h"
Johannes Berg2a519312009-02-10 21:25:55 +010023
Johannes Berg776b3582013-02-01 02:06:18 +010024/**
25 * DOC: BSS tree/list structure
26 *
27 * At the top level, the BSS list is kept in both a list in each
28 * registered device (@bss_list) as well as an RB-tree for faster
29 * lookup. In the RB-tree, entries can be looked up using their
30 * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
31 * for other BSSes.
32 *
33 * Due to the possibility of hidden SSIDs, there's a second level
34 * structure, the "hidden_list" and "hidden_beacon_bss" pointer.
35 * The hidden_list connects all BSSes belonging to a single AP
36 * that has a hidden SSID, and connects beacon and probe response
37 * entries. For a probe response entry for a hidden SSID, the
38 * hidden_beacon_bss pointer points to the BSS struct holding the
39 * beacon's information.
40 *
41 * Reference counting is done for all these references except for
42 * the hidden_list, so that a beacon BSS struct that is otherwise
43 * not referenced has one reference for being on the bss_list and
44 * one for each probe response entry that points to it using the
45 * hidden_beacon_bss pointer. When a BSS struct that has such a
46 * pointer is get/put, the refcount update is also propagated to
47 * the referenced struct, this ensure that it cannot get removed
48 * while somebody is using the probe response version.
49 *
50 * Note that the hidden_beacon_bss pointer never changes, due to
51 * the reference counting. Therefore, no locking is needed for
52 * it.
53 *
54 * Also note that the hidden_beacon_bss pointer is only relevant
55 * if the driver uses something other than the IEs, e.g. private
56 * data stored stored in the BSS struct, since the beacon IEs are
57 * also linked into the probe response struct.
58 */
59
Johannes Berg9853a552016-11-15 12:05:11 +010060/*
61 * Limit the number of BSS entries stored in mac80211. Each one is
62 * a bit over 4k at most, so this limits to roughly 4-5M of memory.
63 * If somebody wants to really attack this though, they'd likely
64 * use small beacons, and only one type of frame, limiting each of
65 * the entries to a much smaller size (in order to generate more
66 * entries in total, so overhead is bigger.)
67 */
68static int bss_entries_limit = 1000;
69module_param(bss_entries_limit, int, 0644);
70MODULE_PARM_DESC(bss_entries_limit,
71 "limit to number of scan BSS entries (per wiphy, default 1000)");
72
Rajkumar Manoharan6993e4d2012-04-13 16:38:40 +053073#define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
Johannes Berg2a519312009-02-10 21:25:55 +010074
Johannes Berg776b3582013-02-01 02:06:18 +010075static void bss_free(struct cfg80211_internal_bss *bss)
Amitkumar Karware8e27c62012-10-11 21:03:33 -070076{
Johannes Berg9caf0362012-11-29 01:25:20 +010077 struct cfg80211_bss_ies *ies;
Johannes Bergb629ea32012-11-28 22:14:56 +010078
79 if (WARN_ON(atomic_read(&bss->hold)))
80 return;
81
Johannes Berg9caf0362012-11-29 01:25:20 +010082 ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
Johannes Berg776b3582013-02-01 02:06:18 +010083 if (ies && !bss->pub.hidden_beacon_bss)
Johannes Berg9caf0362012-11-29 01:25:20 +010084 kfree_rcu(ies, rcu_head);
85 ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
86 if (ies)
87 kfree_rcu(ies, rcu_head);
Amitkumar Karware8e27c62012-10-11 21:03:33 -070088
Johannes Berg776b3582013-02-01 02:06:18 +010089 /*
90 * This happens when the module is removed, it doesn't
91 * really matter any more save for completeness
92 */
93 if (!list_empty(&bss->hidden_list))
94 list_del(&bss->hidden_list);
95
Amitkumar Karware8e27c62012-10-11 21:03:33 -070096 kfree(bss);
97}
98
Zhao, Gang1b8ec872014-04-21 12:53:02 +080099static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
Johannes Berg776b3582013-02-01 02:06:18 +0100100 struct cfg80211_internal_bss *bss)
Johannes Berg0532d4f2013-02-01 01:34:36 +0100101{
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800102 lockdep_assert_held(&rdev->bss_lock);
Johannes Berg776b3582013-02-01 02:06:18 +0100103
104 bss->refcount++;
105 if (bss->pub.hidden_beacon_bss) {
106 bss = container_of(bss->pub.hidden_beacon_bss,
107 struct cfg80211_internal_bss,
108 pub);
109 bss->refcount++;
110 }
Johannes Berg0532d4f2013-02-01 01:34:36 +0100111}
112
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800113static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
Johannes Berg776b3582013-02-01 02:06:18 +0100114 struct cfg80211_internal_bss *bss)
Johannes Berg0532d4f2013-02-01 01:34:36 +0100115{
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800116 lockdep_assert_held(&rdev->bss_lock);
Johannes Berg776b3582013-02-01 02:06:18 +0100117
118 if (bss->pub.hidden_beacon_bss) {
119 struct cfg80211_internal_bss *hbss;
120 hbss = container_of(bss->pub.hidden_beacon_bss,
121 struct cfg80211_internal_bss,
122 pub);
123 hbss->refcount--;
124 if (hbss->refcount == 0)
125 bss_free(hbss);
126 }
127 bss->refcount--;
128 if (bss->refcount == 0)
129 bss_free(bss);
Johannes Berg0532d4f2013-02-01 01:34:36 +0100130}
131
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800132static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
Amitkumar Karware8e27c62012-10-11 21:03:33 -0700133 struct cfg80211_internal_bss *bss)
134{
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800135 lockdep_assert_held(&rdev->bss_lock);
Johannes Berg4b1af472013-02-01 01:05:43 +0100136
Johannes Berg776b3582013-02-01 02:06:18 +0100137 if (!list_empty(&bss->hidden_list)) {
138 /*
139 * don't remove the beacon entry if it has
140 * probe responses associated with it
141 */
142 if (!bss->pub.hidden_beacon_bss)
143 return false;
144 /*
145 * if it's a probe response entry break its
146 * link to the other entries in the group
147 */
148 list_del_init(&bss->hidden_list);
149 }
150
Amitkumar Karware8e27c62012-10-11 21:03:33 -0700151 list_del_init(&bss->list);
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800152 rb_erase(&bss->rbn, &rdev->bss_tree);
Johannes Berg9853a552016-11-15 12:05:11 +0100153 rdev->bss_entries--;
154 WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
155 "rdev bss entries[%d]/list[empty:%d] corruption\n",
156 rdev->bss_entries, list_empty(&rdev->bss_list));
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800157 bss_ref_put(rdev, bss);
Johannes Berg776b3582013-02-01 02:06:18 +0100158 return true;
Amitkumar Karware8e27c62012-10-11 21:03:33 -0700159}
160
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800161static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
Sam Leffler15d60302012-10-11 21:03:34 -0700162 unsigned long expire_time)
163{
164 struct cfg80211_internal_bss *bss, *tmp;
165 bool expired = false;
166
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800167 lockdep_assert_held(&rdev->bss_lock);
Johannes Berg4b1af472013-02-01 01:05:43 +0100168
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800169 list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
Sam Leffler15d60302012-10-11 21:03:34 -0700170 if (atomic_read(&bss->hold))
171 continue;
172 if (!time_after(expire_time, bss->ts))
173 continue;
174
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800175 if (__cfg80211_unlink_bss(rdev, bss))
Johannes Berg776b3582013-02-01 02:06:18 +0100176 expired = true;
Sam Leffler15d60302012-10-11 21:03:34 -0700177 }
178
179 if (expired)
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800180 rdev->bss_generation++;
Sam Leffler15d60302012-10-11 21:03:34 -0700181}
182
Johannes Berg9853a552016-11-15 12:05:11 +0100183static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev)
184{
185 struct cfg80211_internal_bss *bss, *oldest = NULL;
186 bool ret;
187
188 lockdep_assert_held(&rdev->bss_lock);
189
190 list_for_each_entry(bss, &rdev->bss_list, list) {
191 if (atomic_read(&bss->hold))
192 continue;
193
194 if (!list_empty(&bss->hidden_list) &&
195 !bss->pub.hidden_beacon_bss)
196 continue;
197
198 if (oldest && time_before(oldest->ts, bss->ts))
199 continue;
200 oldest = bss;
201 }
202
203 if (WARN_ON(!oldest))
204 return false;
205
206 /*
207 * The callers make sure to increase rdev->bss_generation if anything
208 * gets removed (and a new entry added), so there's no need to also do
209 * it here.
210 */
211
212 ret = __cfg80211_unlink_bss(rdev, oldest);
213 WARN_ON(!ret);
214 return ret;
215}
216
Johannes Bergf9d15d12014-01-22 11:14:19 +0200217void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
218 bool send_message)
Johannes Berg2a519312009-02-10 21:25:55 +0100219{
Johannes Berg667503dd2009-07-07 03:56:11 +0200220 struct cfg80211_scan_request *request;
Johannes Bergfd014282012-06-18 19:17:03 +0200221 struct wireless_dev *wdev;
Johannes Bergf9d15d12014-01-22 11:14:19 +0200222 struct sk_buff *msg;
Johannes Berg3d23e342009-09-29 23:27:28 +0200223#ifdef CONFIG_CFG80211_WEXT
Johannes Berg2a519312009-02-10 21:25:55 +0100224 union iwreq_data wrqu;
225#endif
226
Johannes Berg5fe231e2013-05-08 21:45:15 +0200227 ASSERT_RTNL();
Johannes Berg01a0ac42009-08-20 21:36:16 +0200228
Johannes Bergf9d15d12014-01-22 11:14:19 +0200229 if (rdev->scan_msg) {
230 nl80211_send_scan_result(rdev, rdev->scan_msg);
231 rdev->scan_msg = NULL;
232 return;
233 }
Johannes Berg667503dd2009-07-07 03:56:11 +0200234
Johannes Bergf9d15d12014-01-22 11:14:19 +0200235 request = rdev->scan_req;
Johannes Berg01a0ac42009-08-20 21:36:16 +0200236 if (!request)
237 return;
238
Johannes Bergfd014282012-06-18 19:17:03 +0200239 wdev = request->wdev;
Johannes Berg2a519312009-02-10 21:25:55 +0100240
Johannes Berg6829c872009-07-02 09:13:27 +0200241 /*
242 * This must be before sending the other events!
243 * Otherwise, wpa_supplicant gets completely confused with
244 * wext events.
245 */
Johannes Bergfd014282012-06-18 19:17:03 +0200246 if (wdev->netdev)
247 cfg80211_sme_scan_done(wdev->netdev);
Johannes Berg6829c872009-07-02 09:13:27 +0200248
Avraham Stern1d762502016-07-05 17:10:13 +0300249 if (!request->info.aborted &&
Johannes Bergf9d15d12014-01-22 11:14:19 +0200250 request->flags & NL80211_SCAN_FLAG_FLUSH) {
251 /* flush entries from previous scans */
252 spin_lock_bh(&rdev->bss_lock);
253 __cfg80211_bss_expire(rdev, request->scan_start);
254 spin_unlock_bh(&rdev->bss_lock);
Sam Leffler15d60302012-10-11 21:03:34 -0700255 }
Johannes Berg2a519312009-02-10 21:25:55 +0100256
Avraham Stern1d762502016-07-05 17:10:13 +0300257 msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
Johannes Bergf9d15d12014-01-22 11:14:19 +0200258
Johannes Berg3d23e342009-09-29 23:27:28 +0200259#ifdef CONFIG_CFG80211_WEXT
Avraham Stern1d762502016-07-05 17:10:13 +0300260 if (wdev->netdev && !request->info.aborted) {
Johannes Berg2a519312009-02-10 21:25:55 +0100261 memset(&wrqu, 0, sizeof(wrqu));
262
Johannes Bergfd014282012-06-18 19:17:03 +0200263 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
Johannes Berg2a519312009-02-10 21:25:55 +0100264 }
265#endif
266
Johannes Bergfd014282012-06-18 19:17:03 +0200267 if (wdev->netdev)
268 dev_put(wdev->netdev);
Johannes Berg2a519312009-02-10 21:25:55 +0100269
Johannes Berg36e6fea2009-08-12 22:21:21 +0200270 rdev->scan_req = NULL;
Eliad Peller4a58e7c2013-12-05 18:30:17 +0200271 kfree(request);
Johannes Bergf9d15d12014-01-22 11:14:19 +0200272
273 if (!send_message)
274 rdev->scan_msg = msg;
275 else
276 nl80211_send_scan_result(rdev, msg);
Johannes Berg2a519312009-02-10 21:25:55 +0100277}
Johannes Berg667503dd2009-07-07 03:56:11 +0200278
Johannes Berg36e6fea2009-08-12 22:21:21 +0200279void __cfg80211_scan_done(struct work_struct *wk)
280{
281 struct cfg80211_registered_device *rdev;
282
283 rdev = container_of(wk, struct cfg80211_registered_device,
284 scan_done_wk);
285
Johannes Berg5fe231e2013-05-08 21:45:15 +0200286 rtnl_lock();
Johannes Bergf9d15d12014-01-22 11:14:19 +0200287 ___cfg80211_scan_done(rdev, true);
Johannes Berg5fe231e2013-05-08 21:45:15 +0200288 rtnl_unlock();
Johannes Berg36e6fea2009-08-12 22:21:21 +0200289}
290
Avraham Stern1d762502016-07-05 17:10:13 +0300291void cfg80211_scan_done(struct cfg80211_scan_request *request,
292 struct cfg80211_scan_info *info)
Johannes Berg667503dd2009-07-07 03:56:11 +0200293{
Avraham Stern1d762502016-07-05 17:10:13 +0300294 trace_cfg80211_scan_done(request, info);
Zhao, Gangf26cbf42014-04-21 12:53:03 +0800295 WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req);
Johannes Berg667503dd2009-07-07 03:56:11 +0200296
Avraham Stern1d762502016-07-05 17:10:13 +0300297 request->info = *info;
Johannes Berg5fe231e2013-05-08 21:45:15 +0200298 request->notified = true;
Zhao, Gangf26cbf42014-04-21 12:53:03 +0800299 queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk);
Johannes Berg667503dd2009-07-07 03:56:11 +0200300}
Johannes Berg2a519312009-02-10 21:25:55 +0100301EXPORT_SYMBOL(cfg80211_scan_done);
302
Luciano Coelho807f8a82011-05-11 17:09:35 +0300303void __cfg80211_sched_scan_results(struct work_struct *wk)
304{
305 struct cfg80211_registered_device *rdev;
Sam Leffler15d60302012-10-11 21:03:34 -0700306 struct cfg80211_sched_scan_request *request;
Luciano Coelho807f8a82011-05-11 17:09:35 +0300307
308 rdev = container_of(wk, struct cfg80211_registered_device,
309 sched_scan_results_wk);
310
Johannes Berg5fe231e2013-05-08 21:45:15 +0200311 rtnl_lock();
Luciano Coelho807f8a82011-05-11 17:09:35 +0300312
Jukka Rissanen31a60ed2014-12-15 13:25:38 +0200313 request = rtnl_dereference(rdev->sched_scan_req);
Johannes Berg79845c62013-10-21 11:33:35 +0200314
Luciano Coelho807f8a82011-05-11 17:09:35 +0300315 /* we don't have sched_scan_req anymore if the scan is stopping */
Sam Leffler15d60302012-10-11 21:03:34 -0700316 if (request) {
317 if (request->flags & NL80211_SCAN_FLAG_FLUSH) {
318 /* flush entries from previous scans */
319 spin_lock_bh(&rdev->bss_lock);
320 __cfg80211_bss_expire(rdev, request->scan_start);
321 spin_unlock_bh(&rdev->bss_lock);
Avraham Stern3b06d272015-10-12 09:51:34 +0300322 request->scan_start = jiffies;
Sam Leffler15d60302012-10-11 21:03:34 -0700323 }
324 nl80211_send_sched_scan_results(rdev, request->dev);
325 }
Luciano Coelho807f8a82011-05-11 17:09:35 +0300326
Johannes Berg5fe231e2013-05-08 21:45:15 +0200327 rtnl_unlock();
Luciano Coelho807f8a82011-05-11 17:09:35 +0300328}
329
330void cfg80211_sched_scan_results(struct wiphy *wiphy)
331{
Beni Lev4ee3e062012-08-27 12:49:39 +0300332 trace_cfg80211_sched_scan_results(wiphy);
Luciano Coelho807f8a82011-05-11 17:09:35 +0300333 /* ignore if we're not scanning */
Jukka Rissanen31a60ed2014-12-15 13:25:38 +0200334
335 if (rcu_access_pointer(wiphy_to_rdev(wiphy)->sched_scan_req))
Luciano Coelho807f8a82011-05-11 17:09:35 +0300336 queue_work(cfg80211_wq,
Zhao, Gangf26cbf42014-04-21 12:53:03 +0800337 &wiphy_to_rdev(wiphy)->sched_scan_results_wk);
Luciano Coelho807f8a82011-05-11 17:09:35 +0300338}
339EXPORT_SYMBOL(cfg80211_sched_scan_results);
340
Eliad Peller792e6aa2014-04-30 16:14:23 +0300341void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy)
Luciano Coelho807f8a82011-05-11 17:09:35 +0300342{
Zhao, Gangf26cbf42014-04-21 12:53:03 +0800343 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
Luciano Coelho807f8a82011-05-11 17:09:35 +0300344
Eliad Peller792e6aa2014-04-30 16:14:23 +0300345 ASSERT_RTNL();
346
Beni Lev4ee3e062012-08-27 12:49:39 +0300347 trace_cfg80211_sched_scan_stopped(wiphy);
348
Luciano Coelho807f8a82011-05-11 17:09:35 +0300349 __cfg80211_stop_sched_scan(rdev, true);
Eliad Peller792e6aa2014-04-30 16:14:23 +0300350}
351EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl);
352
353void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
354{
355 rtnl_lock();
356 cfg80211_sched_scan_stopped_rtnl(wiphy);
Johannes Berg5fe231e2013-05-08 21:45:15 +0200357 rtnl_unlock();
Luciano Coelho807f8a82011-05-11 17:09:35 +0300358}
Luciano Coelho807f8a82011-05-11 17:09:35 +0300359EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
360
361int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
362 bool driver_initiated)
363{
Jukka Rissanen31a60ed2014-12-15 13:25:38 +0200364 struct cfg80211_sched_scan_request *sched_scan_req;
Luciano Coelho807f8a82011-05-11 17:09:35 +0300365 struct net_device *dev;
366
Johannes Berg5fe231e2013-05-08 21:45:15 +0200367 ASSERT_RTNL();
Luciano Coelho807f8a82011-05-11 17:09:35 +0300368
369 if (!rdev->sched_scan_req)
Luciano Coelho1a84ff72011-07-08 11:16:16 +0300370 return -ENOENT;
Luciano Coelho807f8a82011-05-11 17:09:35 +0300371
Jukka Rissanen31a60ed2014-12-15 13:25:38 +0200372 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
373 dev = sched_scan_req->dev;
Luciano Coelho807f8a82011-05-11 17:09:35 +0300374
Luciano Coelho85a99942011-05-12 16:28:29 +0300375 if (!driver_initiated) {
Hila Gonene35e4d22012-06-27 17:19:42 +0300376 int err = rdev_sched_scan_stop(rdev, dev);
Luciano Coelho85a99942011-05-12 16:28:29 +0300377 if (err)
378 return err;
379 }
Luciano Coelho807f8a82011-05-11 17:09:35 +0300380
381 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
382
Jukka Rissanen31a60ed2014-12-15 13:25:38 +0200383 RCU_INIT_POINTER(rdev->sched_scan_req, NULL);
384 kfree_rcu(sched_scan_req, rcu_head);
Luciano Coelho807f8a82011-05-11 17:09:35 +0300385
Jesper Juhl3b4670f2011-06-29 22:49:33 +0200386 return 0;
Luciano Coelho807f8a82011-05-11 17:09:35 +0300387}
388
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800389void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
Dan Williamscb3a8ee2009-02-11 17:14:43 -0500390 unsigned long age_secs)
391{
392 struct cfg80211_internal_bss *bss;
393 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
394
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800395 spin_lock_bh(&rdev->bss_lock);
396 list_for_each_entry(bss, &rdev->bss_list, list)
Dan Williamscb3a8ee2009-02-11 17:14:43 -0500397 bss->ts -= age_jiffies;
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800398 spin_unlock_bh(&rdev->bss_lock);
Dan Williamscb3a8ee2009-02-11 17:14:43 -0500399}
400
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800401void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
Johannes Berg2a519312009-02-10 21:25:55 +0100402{
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800403 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
Johannes Berg2a519312009-02-10 21:25:55 +0100404}
405
Luca Coelhofbd05e42016-09-15 18:15:09 +0300406const u8 *cfg80211_find_ie_match(u8 eid, const u8 *ies, int len,
407 const u8 *match, int match_len,
408 int match_offset)
Johannes Berg2a519312009-02-10 21:25:55 +0100409{
Luca Coelhofbd05e42016-09-15 18:15:09 +0300410 /* match_offset can't be smaller than 2, unless match_len is
411 * zero, in which case match_offset must be zero as well.
412 */
413 if (WARN_ON((match_len && match_offset < 2) ||
414 (!match_len && match_offset)))
415 return NULL;
416
417 while (len >= 2 && len >= ies[1] + 2) {
418 if ((ies[0] == eid) &&
419 (ies[1] + 2 >= match_offset + match_len) &&
420 !memcmp(ies + match_offset, match, match_len))
421 return ies;
422
Johannes Berg2a519312009-02-10 21:25:55 +0100423 len -= ies[1] + 2;
424 ies += ies[1] + 2;
425 }
Luca Coelhofbd05e42016-09-15 18:15:09 +0300426
427 return NULL;
Johannes Berg2a519312009-02-10 21:25:55 +0100428}
Luca Coelhofbd05e42016-09-15 18:15:09 +0300429EXPORT_SYMBOL(cfg80211_find_ie_match);
Johannes Berg2a519312009-02-10 21:25:55 +0100430
Emmanuel Grumbach9e9ea432016-05-03 16:08:07 +0300431const u8 *cfg80211_find_vendor_ie(unsigned int oui, int oui_type,
Eliad Peller0c28ec52011-09-15 11:53:01 +0300432 const u8 *ies, int len)
433{
Luca Coelhofbd05e42016-09-15 18:15:09 +0300434 const u8 *ie;
435 u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
436 int match_len = (oui_type < 0) ? 3 : sizeof(match);
Eliad Peller0c28ec52011-09-15 11:53:01 +0300437
Emmanuel Grumbach9e9ea432016-05-03 16:08:07 +0300438 if (WARN_ON(oui_type > 0xff))
439 return NULL;
440
Luca Coelhofbd05e42016-09-15 18:15:09 +0300441 ie = cfg80211_find_ie_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
442 match, match_len, 2);
Eliad Peller0c28ec52011-09-15 11:53:01 +0300443
Luca Coelhofbd05e42016-09-15 18:15:09 +0300444 if (ie && (ie[1] < 4))
445 return NULL;
Luciano Coelho67194292013-02-12 20:11:38 +0200446
Luca Coelhofbd05e42016-09-15 18:15:09 +0300447 return ie;
Eliad Peller0c28ec52011-09-15 11:53:01 +0300448}
449EXPORT_SYMBOL(cfg80211_find_vendor_ie);
450
Johannes Berg915de2f2012-11-28 22:39:37 +0100451static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
Johannes Berg2a519312009-02-10 21:25:55 +0100452 const u8 *ssid, size_t ssid_len)
453{
Johannes Berg9caf0362012-11-29 01:25:20 +0100454 const struct cfg80211_bss_ies *ies;
Johannes Berg2a519312009-02-10 21:25:55 +0100455 const u8 *ssidie;
456
Joe Perchesac422d32012-05-08 18:56:55 +0000457 if (bssid && !ether_addr_equal(a->bssid, bssid))
Johannes Berg2a519312009-02-10 21:25:55 +0100458 return false;
459
Johannes Berg79420f02009-02-10 21:25:59 +0100460 if (!ssid)
461 return true;
462
Johannes Berg9caf0362012-11-29 01:25:20 +0100463 ies = rcu_access_pointer(a->ies);
464 if (!ies)
465 return false;
466 ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
Johannes Berg2a519312009-02-10 21:25:55 +0100467 if (!ssidie)
468 return false;
469 if (ssidie[1] != ssid_len)
470 return false;
471 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
472}
473
Johannes Berg4593c4c2013-02-01 19:20:03 +0100474/**
475 * enum bss_compare_mode - BSS compare mode
476 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
477 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
478 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
479 */
480enum bss_compare_mode {
481 BSS_CMP_REGULAR,
482 BSS_CMP_HIDE_ZLEN,
483 BSS_CMP_HIDE_NUL,
484};
485
Dmitry Tarnyagindd9dfb92011-11-04 17:12:07 +0100486static int cmp_bss(struct cfg80211_bss *a,
Johannes Berg5622f5b2013-01-30 00:26:45 +0100487 struct cfg80211_bss *b,
Johannes Berg4593c4c2013-02-01 19:20:03 +0100488 enum bss_compare_mode mode)
Dmitry Tarnyagindd9dfb92011-11-04 17:12:07 +0100489{
Johannes Berg9caf0362012-11-29 01:25:20 +0100490 const struct cfg80211_bss_ies *a_ies, *b_ies;
Johannes Berg3af63412013-01-30 00:40:20 +0100491 const u8 *ie1 = NULL;
492 const u8 *ie2 = NULL;
Johannes Berg5622f5b2013-01-30 00:26:45 +0100493 int i, r;
Dmitry Tarnyagindd9dfb92011-11-04 17:12:07 +0100494
Johannes Berg3af63412013-01-30 00:40:20 +0100495 if (a->channel != b->channel)
496 return b->channel->center_freq - a->channel->center_freq;
Dmitry Tarnyagindd9dfb92011-11-04 17:12:07 +0100497
Johannes Berg9caf0362012-11-29 01:25:20 +0100498 a_ies = rcu_access_pointer(a->ies);
499 if (!a_ies)
500 return -1;
501 b_ies = rcu_access_pointer(b->ies);
502 if (!b_ies)
503 return 1;
504
Johannes Berg3af63412013-01-30 00:40:20 +0100505 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
506 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
507 a_ies->data, a_ies->len);
508 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
509 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
510 b_ies->data, b_ies->len);
511 if (ie1 && ie2) {
512 int mesh_id_cmp;
513
514 if (ie1[1] == ie2[1])
515 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
516 else
517 mesh_id_cmp = ie2[1] - ie1[1];
518
519 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
520 a_ies->data, a_ies->len);
521 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
522 b_ies->data, b_ies->len);
523 if (ie1 && ie2) {
524 if (mesh_id_cmp)
525 return mesh_id_cmp;
526 if (ie1[1] != ie2[1])
527 return ie2[1] - ie1[1];
528 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
529 }
530 }
531
Johannes Berg3af63412013-01-30 00:40:20 +0100532 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
533 if (r)
534 return r;
535
Johannes Berg9caf0362012-11-29 01:25:20 +0100536 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
537 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
Dmitry Tarnyagindd9dfb92011-11-04 17:12:07 +0100538
Johannes Berg5622f5b2013-01-30 00:26:45 +0100539 if (!ie1 && !ie2)
540 return 0;
541
Johannes Bergf94f8b12012-11-28 22:42:34 +0100542 /*
Johannes Berg5622f5b2013-01-30 00:26:45 +0100543 * Note that with "hide_ssid", the function returns a match if
544 * the already-present BSS ("b") is a hidden SSID beacon for
545 * the new BSS ("a").
Johannes Bergf94f8b12012-11-28 22:42:34 +0100546 */
Dmitry Tarnyagindd9dfb92011-11-04 17:12:07 +0100547
548 /* sort missing IE before (left of) present IE */
549 if (!ie1)
550 return -1;
551 if (!ie2)
552 return 1;
553
Johannes Berg4593c4c2013-02-01 19:20:03 +0100554 switch (mode) {
555 case BSS_CMP_HIDE_ZLEN:
556 /*
557 * In ZLEN mode we assume the BSS entry we're
558 * looking for has a zero-length SSID. So if
559 * the one we're looking at right now has that,
560 * return 0. Otherwise, return the difference
561 * in length, but since we're looking for the
562 * 0-length it's really equivalent to returning
563 * the length of the one we're looking at.
564 *
565 * No content comparison is needed as we assume
566 * the content length is zero.
567 */
568 return ie2[1];
569 case BSS_CMP_REGULAR:
570 default:
571 /* sort by length first, then by contents */
572 if (ie1[1] != ie2[1])
573 return ie2[1] - ie1[1];
Johannes Berg5622f5b2013-01-30 00:26:45 +0100574 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
Johannes Berg4593c4c2013-02-01 19:20:03 +0100575 case BSS_CMP_HIDE_NUL:
576 if (ie1[1] != ie2[1])
577 return ie2[1] - ie1[1];
578 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
579 for (i = 0; i < ie2[1]; i++)
580 if (ie2[i + 2])
581 return -1;
582 return 0;
583 }
Dmitry Tarnyagindd9dfb92011-11-04 17:12:07 +0100584}
585
Dedy Lansky6eb18132015-02-08 15:52:03 +0200586static bool cfg80211_bss_type_match(u16 capability,
Johannes Berg57fbcce2016-04-12 15:56:15 +0200587 enum nl80211_band band,
Dedy Lansky6eb18132015-02-08 15:52:03 +0200588 enum ieee80211_bss_type bss_type)
589{
590 bool ret = true;
591 u16 mask, val;
592
593 if (bss_type == IEEE80211_BSS_TYPE_ANY)
594 return ret;
595
Johannes Berg57fbcce2016-04-12 15:56:15 +0200596 if (band == NL80211_BAND_60GHZ) {
Dedy Lansky6eb18132015-02-08 15:52:03 +0200597 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
598 switch (bss_type) {
599 case IEEE80211_BSS_TYPE_ESS:
600 val = WLAN_CAPABILITY_DMG_TYPE_AP;
601 break;
602 case IEEE80211_BSS_TYPE_PBSS:
603 val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
604 break;
605 case IEEE80211_BSS_TYPE_IBSS:
606 val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
607 break;
608 default:
609 return false;
610 }
611 } else {
612 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
613 switch (bss_type) {
614 case IEEE80211_BSS_TYPE_ESS:
615 val = WLAN_CAPABILITY_ESS;
616 break;
617 case IEEE80211_BSS_TYPE_IBSS:
618 val = WLAN_CAPABILITY_IBSS;
619 break;
620 case IEEE80211_BSS_TYPE_MBSS:
621 val = 0;
622 break;
623 default:
624 return false;
625 }
626 }
627
628 ret = ((capability & mask) == val);
629 return ret;
630}
631
Ben Greear0e3a39b2013-06-19 14:06:27 -0700632/* Returned bss is reference counted and must be cleaned up appropriately. */
Johannes Berg2a519312009-02-10 21:25:55 +0100633struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
634 struct ieee80211_channel *channel,
635 const u8 *bssid,
Johannes Berg79420f02009-02-10 21:25:59 +0100636 const u8 *ssid, size_t ssid_len,
Dedy Lansky6eb18132015-02-08 15:52:03 +0200637 enum ieee80211_bss_type bss_type,
638 enum ieee80211_privacy privacy)
Johannes Berg2a519312009-02-10 21:25:55 +0100639{
Zhao, Gangf26cbf42014-04-21 12:53:03 +0800640 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
Johannes Berg2a519312009-02-10 21:25:55 +0100641 struct cfg80211_internal_bss *bss, *res = NULL;
Johannes Bergccb6c132010-07-13 10:55:38 +0200642 unsigned long now = jiffies;
Dedy Lansky6eb18132015-02-08 15:52:03 +0200643 int bss_privacy;
Johannes Berg2a519312009-02-10 21:25:55 +0100644
Dedy Lansky6eb18132015-02-08 15:52:03 +0200645 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
646 privacy);
Beni Lev4ee3e062012-08-27 12:49:39 +0300647
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800648 spin_lock_bh(&rdev->bss_lock);
Johannes Berg2a519312009-02-10 21:25:55 +0100649
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800650 list_for_each_entry(bss, &rdev->bss_list, list) {
Dedy Lansky6eb18132015-02-08 15:52:03 +0200651 if (!cfg80211_bss_type_match(bss->pub.capability,
652 bss->pub.channel->band, bss_type))
653 continue;
654
655 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
656 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
657 (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
Johannes Berg79420f02009-02-10 21:25:59 +0100658 continue;
Johannes Berg2a519312009-02-10 21:25:55 +0100659 if (channel && bss->pub.channel != channel)
660 continue;
Johannes Bergc14a7402014-04-09 22:36:50 +0200661 if (!is_valid_ether_addr(bss->pub.bssid))
662 continue;
Johannes Bergccb6c132010-07-13 10:55:38 +0200663 /* Don't get expired BSS structs */
664 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
665 !atomic_read(&bss->hold))
666 continue;
Johannes Berg2a519312009-02-10 21:25:55 +0100667 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
668 res = bss;
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800669 bss_ref_get(rdev, res);
Johannes Berg2a519312009-02-10 21:25:55 +0100670 break;
671 }
672 }
673
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800674 spin_unlock_bh(&rdev->bss_lock);
Johannes Berg2a519312009-02-10 21:25:55 +0100675 if (!res)
676 return NULL;
Beni Lev4ee3e062012-08-27 12:49:39 +0300677 trace_cfg80211_return_bss(&res->pub);
Johannes Berg2a519312009-02-10 21:25:55 +0100678 return &res->pub;
679}
680EXPORT_SYMBOL(cfg80211_get_bss);
681
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800682static void rb_insert_bss(struct cfg80211_registered_device *rdev,
Johannes Berg2a519312009-02-10 21:25:55 +0100683 struct cfg80211_internal_bss *bss)
684{
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800685 struct rb_node **p = &rdev->bss_tree.rb_node;
Johannes Berg2a519312009-02-10 21:25:55 +0100686 struct rb_node *parent = NULL;
687 struct cfg80211_internal_bss *tbss;
688 int cmp;
689
690 while (*p) {
691 parent = *p;
692 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
693
Johannes Berg4593c4c2013-02-01 19:20:03 +0100694 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
Johannes Berg2a519312009-02-10 21:25:55 +0100695
696 if (WARN_ON(!cmp)) {
697 /* will sort of leak this BSS */
698 return;
699 }
700
701 if (cmp < 0)
702 p = &(*p)->rb_left;
703 else
704 p = &(*p)->rb_right;
705 }
706
707 rb_link_node(&bss->rbn, parent, p);
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800708 rb_insert_color(&bss->rbn, &rdev->bss_tree);
Johannes Berg2a519312009-02-10 21:25:55 +0100709}
710
711static struct cfg80211_internal_bss *
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800712rb_find_bss(struct cfg80211_registered_device *rdev,
Johannes Berg5622f5b2013-01-30 00:26:45 +0100713 struct cfg80211_internal_bss *res,
Johannes Berg4593c4c2013-02-01 19:20:03 +0100714 enum bss_compare_mode mode)
Johannes Berg2a519312009-02-10 21:25:55 +0100715{
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800716 struct rb_node *n = rdev->bss_tree.rb_node;
Johannes Berg2a519312009-02-10 21:25:55 +0100717 struct cfg80211_internal_bss *bss;
718 int r;
719
720 while (n) {
721 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
Johannes Berg4593c4c2013-02-01 19:20:03 +0100722 r = cmp_bss(&res->pub, &bss->pub, mode);
Dmitry Tarnyagindd9dfb92011-11-04 17:12:07 +0100723
724 if (r == 0)
725 return bss;
726 else if (r < 0)
727 n = n->rb_left;
728 else
729 n = n->rb_right;
730 }
731
732 return NULL;
733}
734
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800735static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
Johannes Berg776b3582013-02-01 02:06:18 +0100736 struct cfg80211_internal_bss *new)
Dmitry Tarnyagindd9dfb92011-11-04 17:12:07 +0100737{
Johannes Berg9caf0362012-11-29 01:25:20 +0100738 const struct cfg80211_bss_ies *ies;
Johannes Berg776b3582013-02-01 02:06:18 +0100739 struct cfg80211_internal_bss *bss;
740 const u8 *ie;
741 int i, ssidlen;
742 u8 fold = 0;
Johannes Berg9853a552016-11-15 12:05:11 +0100743 u32 n_entries = 0;
Johannes Berg9caf0362012-11-29 01:25:20 +0100744
Johannes Berg776b3582013-02-01 02:06:18 +0100745 ies = rcu_access_pointer(new->pub.beacon_ies);
Johannes Berg9caf0362012-11-29 01:25:20 +0100746 if (WARN_ON(!ies))
Johannes Berg776b3582013-02-01 02:06:18 +0100747 return false;
Dmitry Tarnyagindd9dfb92011-11-04 17:12:07 +0100748
Johannes Berg776b3582013-02-01 02:06:18 +0100749 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
750 if (!ie) {
751 /* nothing to do */
752 return true;
753 }
754
755 ssidlen = ie[1];
756 for (i = 0; i < ssidlen; i++)
757 fold |= ie[2 + i];
758
759 if (fold) {
760 /* not a hidden SSID */
761 return true;
762 }
763
764 /* This is the bad part ... */
765
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800766 list_for_each_entry(bss, &rdev->bss_list, list) {
Johannes Berg9853a552016-11-15 12:05:11 +0100767 /*
768 * we're iterating all the entries anyway, so take the
769 * opportunity to validate the list length accounting
770 */
771 n_entries++;
772
Johannes Berg776b3582013-02-01 02:06:18 +0100773 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
774 continue;
775 if (bss->pub.channel != new->pub.channel)
776 continue;
Simon Wunderlichdcd6eac2013-07-08 16:55:49 +0200777 if (bss->pub.scan_width != new->pub.scan_width)
778 continue;
Johannes Berg776b3582013-02-01 02:06:18 +0100779 if (rcu_access_pointer(bss->pub.beacon_ies))
780 continue;
781 ies = rcu_access_pointer(bss->pub.ies);
782 if (!ies)
783 continue;
784 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
785 if (!ie)
786 continue;
787 if (ssidlen && ie[1] != ssidlen)
788 continue;
Johannes Berg776b3582013-02-01 02:06:18 +0100789 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
790 continue;
791 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
792 list_del(&bss->hidden_list);
793 /* combine them */
794 list_add(&bss->hidden_list, &new->hidden_list);
795 bss->pub.hidden_beacon_bss = &new->pub;
796 new->refcount += bss->refcount;
797 rcu_assign_pointer(bss->pub.beacon_ies,
798 new->pub.beacon_ies);
799 }
800
Johannes Berg9853a552016-11-15 12:05:11 +0100801 WARN_ONCE(n_entries != rdev->bss_entries,
802 "rdev bss entries[%d]/list[len:%d] corruption\n",
803 rdev->bss_entries, n_entries);
804
Johannes Berg776b3582013-02-01 02:06:18 +0100805 return true;
Dmitry Tarnyagindd9dfb92011-11-04 17:12:07 +0100806}
807
Ben Greear0e3a39b2013-06-19 14:06:27 -0700808/* Returned bss is reference counted and must be cleaned up appropriately. */
Dmitry Tarnyagindd9dfb92011-11-04 17:12:07 +0100809static struct cfg80211_internal_bss *
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800810cfg80211_bss_update(struct cfg80211_registered_device *rdev,
Emmanuel Grumbach3afc2162014-03-04 16:50:13 +0200811 struct cfg80211_internal_bss *tmp,
812 bool signal_valid)
Johannes Berg2a519312009-02-10 21:25:55 +0100813{
814 struct cfg80211_internal_bss *found = NULL;
Johannes Berg2a519312009-02-10 21:25:55 +0100815
Johannes Berg9caf0362012-11-29 01:25:20 +0100816 if (WARN_ON(!tmp->pub.channel))
Johannes Berg2a519312009-02-10 21:25:55 +0100817 return NULL;
Johannes Berg2a519312009-02-10 21:25:55 +0100818
Johannes Berg9caf0362012-11-29 01:25:20 +0100819 tmp->ts = jiffies;
Johannes Berg2a519312009-02-10 21:25:55 +0100820
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800821 spin_lock_bh(&rdev->bss_lock);
Johannes Berg2a519312009-02-10 21:25:55 +0100822
Johannes Berg9caf0362012-11-29 01:25:20 +0100823 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800824 spin_unlock_bh(&rdev->bss_lock);
Johannes Berg9caf0362012-11-29 01:25:20 +0100825 return NULL;
826 }
827
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800828 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
Johannes Berg2a519312009-02-10 21:25:55 +0100829
Johannes Bergcd1658f2009-04-16 15:00:58 +0200830 if (found) {
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200831 /* Update IEs */
Johannes Berg9caf0362012-11-29 01:25:20 +0100832 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
833 const struct cfg80211_bss_ies *old;
Johannes Bergcd1658f2009-04-16 15:00:58 +0200834
Johannes Berg9caf0362012-11-29 01:25:20 +0100835 old = rcu_access_pointer(found->pub.proberesp_ies);
Johannes Bergcd1658f2009-04-16 15:00:58 +0200836
Johannes Berg9caf0362012-11-29 01:25:20 +0100837 rcu_assign_pointer(found->pub.proberesp_ies,
838 tmp->pub.proberesp_ies);
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200839 /* Override possible earlier Beacon frame IEs */
Johannes Berg9caf0362012-11-29 01:25:20 +0100840 rcu_assign_pointer(found->pub.ies,
841 tmp->pub.proberesp_ies);
842 if (old)
843 kfree_rcu((struct cfg80211_bss_ies *)old,
844 rcu_head);
845 } else if (rcu_access_pointer(tmp->pub.beacon_ies)) {
Johannes Berg9537f222013-02-01 01:19:48 +0100846 const struct cfg80211_bss_ies *old;
Johannes Berg776b3582013-02-01 02:06:18 +0100847 struct cfg80211_internal_bss *bss;
848
849 if (found->pub.hidden_beacon_bss &&
850 !list_empty(&found->hidden_list)) {
Johannes Berg1345ee62013-03-06 10:31:05 +0100851 const struct cfg80211_bss_ies *f;
852
Johannes Berg776b3582013-02-01 02:06:18 +0100853 /*
854 * The found BSS struct is one of the probe
855 * response members of a group, but we're
856 * receiving a beacon (beacon_ies in the tmp
857 * bss is used). This can only mean that the
858 * AP changed its beacon from not having an
859 * SSID to showing it, which is confusing so
860 * drop this information.
861 */
Johannes Berg1345ee62013-03-06 10:31:05 +0100862
863 f = rcu_access_pointer(tmp->pub.beacon_ies);
864 kfree_rcu((struct cfg80211_bss_ies *)f,
865 rcu_head);
Johannes Berg776b3582013-02-01 02:06:18 +0100866 goto drop;
867 }
Johannes Berg915de2f2012-11-28 22:39:37 +0100868
Johannes Berg9caf0362012-11-29 01:25:20 +0100869 old = rcu_access_pointer(found->pub.beacon_ies);
Jouni Malinen34a6edd2010-01-06 16:19:24 +0200870
Johannes Berg9caf0362012-11-29 01:25:20 +0100871 rcu_assign_pointer(found->pub.beacon_ies,
872 tmp->pub.beacon_ies);
Sven Neumann01123e22010-12-09 15:05:24 +0100873
874 /* Override IEs if they were from a beacon before */
Johannes Berg9537f222013-02-01 01:19:48 +0100875 if (old == rcu_access_pointer(found->pub.ies))
Johannes Berg9caf0362012-11-29 01:25:20 +0100876 rcu_assign_pointer(found->pub.ies,
877 tmp->pub.beacon_ies);
Johannes Bergcd1658f2009-04-16 15:00:58 +0200878
Johannes Berg776b3582013-02-01 02:06:18 +0100879 /* Assign beacon IEs to all sub entries */
880 list_for_each_entry(bss, &found->hidden_list,
881 hidden_list) {
882 const struct cfg80211_bss_ies *ies;
883
884 ies = rcu_access_pointer(bss->pub.beacon_ies);
885 WARN_ON(ies != old);
886
887 rcu_assign_pointer(bss->pub.beacon_ies,
888 tmp->pub.beacon_ies);
889 }
890
Johannes Berg9caf0362012-11-29 01:25:20 +0100891 if (old)
892 kfree_rcu((struct cfg80211_bss_ies *)old,
893 rcu_head);
894 }
Johannes Berg1345ee62013-03-06 10:31:05 +0100895
896 found->pub.beacon_interval = tmp->pub.beacon_interval;
Emmanuel Grumbach3afc2162014-03-04 16:50:13 +0200897 /*
898 * don't update the signal if beacon was heard on
899 * adjacent channel.
900 */
901 if (signal_valid)
902 found->pub.signal = tmp->pub.signal;
Johannes Berg1345ee62013-03-06 10:31:05 +0100903 found->pub.capability = tmp->pub.capability;
904 found->ts = tmp->ts;
Dmitry Shmidt6e19bc42015-10-07 11:32:53 +0200905 found->ts_boottime = tmp->ts_boottime;
Avraham Stern1d762502016-07-05 17:10:13 +0300906 found->parent_tsf = tmp->parent_tsf;
Sunil Dutt0c868482017-12-13 19:51:36 +0200907 found->pub.chains = tmp->pub.chains;
908 memcpy(found->pub.chain_signal, tmp->pub.chain_signal,
909 IEEE80211_MAX_CHAINS);
Avraham Stern1d762502016-07-05 17:10:13 +0300910 ether_addr_copy(found->parent_bssid, tmp->parent_bssid);
Johannes Berg2a519312009-02-10 21:25:55 +0100911 } else {
Johannes Berg9caf0362012-11-29 01:25:20 +0100912 struct cfg80211_internal_bss *new;
Dmitry Tarnyagindd9dfb92011-11-04 17:12:07 +0100913 struct cfg80211_internal_bss *hidden;
Johannes Berg9caf0362012-11-29 01:25:20 +0100914 struct cfg80211_bss_ies *ies;
Dmitry Tarnyagindd9dfb92011-11-04 17:12:07 +0100915
Johannes Berg9caf0362012-11-29 01:25:20 +0100916 /*
917 * create a copy -- the "res" variable that is passed in
918 * is allocated on the stack since it's not needed in the
919 * more common case of an update
920 */
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800921 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
Johannes Berg9caf0362012-11-29 01:25:20 +0100922 GFP_ATOMIC);
923 if (!new) {
924 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
925 if (ies)
926 kfree_rcu(ies, rcu_head);
927 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
928 if (ies)
929 kfree_rcu(ies, rcu_head);
Johannes Berg776b3582013-02-01 02:06:18 +0100930 goto drop;
Johannes Berg9caf0362012-11-29 01:25:20 +0100931 }
932 memcpy(new, tmp, sizeof(*new));
Johannes Berg776b3582013-02-01 02:06:18 +0100933 new->refcount = 1;
934 INIT_LIST_HEAD(&new->hidden_list);
935
936 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800937 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
Johannes Berg776b3582013-02-01 02:06:18 +0100938 if (!hidden)
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800939 hidden = rb_find_bss(rdev, tmp,
Johannes Berg776b3582013-02-01 02:06:18 +0100940 BSS_CMP_HIDE_NUL);
941 if (hidden) {
942 new->pub.hidden_beacon_bss = &hidden->pub;
943 list_add(&new->hidden_list,
944 &hidden->hidden_list);
945 hidden->refcount++;
946 rcu_assign_pointer(new->pub.beacon_ies,
947 hidden->pub.beacon_ies);
948 }
949 } else {
950 /*
951 * Ok so we found a beacon, and don't have an entry. If
952 * it's a beacon with hidden SSID, we might be in for an
953 * expensive search for any probe responses that should
954 * be grouped with this beacon for updates ...
955 */
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800956 if (!cfg80211_combine_bsses(rdev, new)) {
Johannes Berg776b3582013-02-01 02:06:18 +0100957 kfree(new);
958 goto drop;
959 }
960 }
961
Johannes Berg9853a552016-11-15 12:05:11 +0100962 if (rdev->bss_entries >= bss_entries_limit &&
963 !cfg80211_bss_expire_oldest(rdev)) {
964 kfree(new);
965 goto drop;
966 }
967
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800968 list_add_tail(&new->list, &rdev->bss_list);
Johannes Berg9853a552016-11-15 12:05:11 +0100969 rdev->bss_entries++;
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800970 rb_insert_bss(rdev, new);
Johannes Berg9caf0362012-11-29 01:25:20 +0100971 found = new;
Johannes Berg2a519312009-02-10 21:25:55 +0100972 }
973
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800974 rdev->bss_generation++;
975 bss_ref_get(rdev, found);
976 spin_unlock_bh(&rdev->bss_lock);
Johannes Berg2a519312009-02-10 21:25:55 +0100977
Johannes Berg2a519312009-02-10 21:25:55 +0100978 return found;
Johannes Berg776b3582013-02-01 02:06:18 +0100979 drop:
Zhao, Gang1b8ec872014-04-21 12:53:02 +0800980 spin_unlock_bh(&rdev->bss_lock);
Johannes Berg776b3582013-02-01 02:06:18 +0100981 return NULL;
Johannes Berg2a519312009-02-10 21:25:55 +0100982}
983
Johannes Berg0172bb72012-11-23 14:23:30 +0100984static struct ieee80211_channel *
985cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
986 struct ieee80211_channel *channel)
987{
988 const u8 *tmp;
989 u32 freq;
990 int channel_number = -1;
991
992 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
993 if (tmp && tmp[1] == 1) {
994 channel_number = tmp[2];
995 } else {
996 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
997 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
998 struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
999
1000 channel_number = htop->primary_chan;
1001 }
1002 }
1003
1004 if (channel_number < 0)
1005 return channel;
1006
1007 freq = ieee80211_channel_to_frequency(channel_number, channel->band);
1008 channel = ieee80211_get_channel(wiphy, freq);
1009 if (!channel)
1010 return NULL;
1011 if (channel->flags & IEEE80211_CHAN_DISABLED)
1012 return NULL;
1013 return channel;
1014}
1015
Ben Greear0e3a39b2013-06-19 14:06:27 -07001016/* Returned bss is reference counted and must be cleaned up appropriately. */
Dmitry Shmidt6e19bc42015-10-07 11:32:53 +02001017struct cfg80211_bss *
1018cfg80211_inform_bss_data(struct wiphy *wiphy,
1019 struct cfg80211_inform_bss *data,
1020 enum cfg80211_bss_frame_type ftype,
1021 const u8 *bssid, u64 tsf, u16 capability,
1022 u16 beacon_interval, const u8 *ie, size_t ielen,
1023 gfp_t gfp)
Jussi Kivilinna06aa7af2009-03-26 23:40:09 +02001024{
Johannes Berg9caf0362012-11-29 01:25:20 +01001025 struct cfg80211_bss_ies *ies;
Emmanuel Grumbach3afc2162014-03-04 16:50:13 +02001026 struct ieee80211_channel *channel;
Johannes Berg9caf0362012-11-29 01:25:20 +01001027 struct cfg80211_internal_bss tmp = {}, *res;
Dedy Lansky6eb18132015-02-08 15:52:03 +02001028 int bss_type;
Emmanuel Grumbach67af9812014-05-18 10:15:24 +03001029 bool signal_valid;
Jussi Kivilinna06aa7af2009-03-26 23:40:09 +02001030
1031 if (WARN_ON(!wiphy))
1032 return NULL;
1033
Sujith22fe88d2010-05-13 10:34:08 +05301034 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
Dmitry Shmidt6e19bc42015-10-07 11:32:53 +02001035 (data->signal < 0 || data->signal > 100)))
Jussi Kivilinna06aa7af2009-03-26 23:40:09 +02001036 return NULL;
1037
Dmitry Shmidt6e19bc42015-10-07 11:32:53 +02001038 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan);
Johannes Berg0172bb72012-11-23 14:23:30 +01001039 if (!channel)
1040 return NULL;
1041
Johannes Berg9caf0362012-11-29 01:25:20 +01001042 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
1043 tmp.pub.channel = channel;
Dmitry Shmidt6e19bc42015-10-07 11:32:53 +02001044 tmp.pub.scan_width = data->scan_width;
1045 tmp.pub.signal = data->signal;
Johannes Berg9caf0362012-11-29 01:25:20 +01001046 tmp.pub.beacon_interval = beacon_interval;
1047 tmp.pub.capability = capability;
Dmitry Shmidt6e19bc42015-10-07 11:32:53 +02001048 tmp.ts_boottime = data->boottime_ns;
1049
Jouni Malinen34a6edd2010-01-06 16:19:24 +02001050 /*
Johannes Berg5bc8c1f2014-08-12 21:01:28 +02001051 * If we do not know here whether the IEs are from a Beacon or Probe
Jouni Malinen34a6edd2010-01-06 16:19:24 +02001052 * Response frame, we need to pick one of the options and only use it
1053 * with the driver that does not provide the full Beacon/Probe Response
1054 * frame. Use Beacon frame pointer to avoid indicating that this should
Johannes Berg50521aa2013-01-30 21:33:19 +01001055 * override the IEs pointer should we have received an earlier
Johannes Berg9caf0362012-11-29 01:25:20 +01001056 * indication of Probe Response data.
Jouni Malinen34a6edd2010-01-06 16:19:24 +02001057 */
Johannes Berg0e227082014-08-12 20:34:30 +02001058 ies = kzalloc(sizeof(*ies) + ielen, gfp);
Johannes Berg9caf0362012-11-29 01:25:20 +01001059 if (!ies)
1060 return NULL;
1061 ies->len = ielen;
Johannes Berg8cef2c92013-02-05 16:54:31 +01001062 ies->tsf = tsf;
Johannes Berg0e227082014-08-12 20:34:30 +02001063 ies->from_beacon = false;
Johannes Berg9caf0362012-11-29 01:25:20 +01001064 memcpy(ies->data, ie, ielen);
Jussi Kivilinna06aa7af2009-03-26 23:40:09 +02001065
Johannes Berg5bc8c1f2014-08-12 21:01:28 +02001066 switch (ftype) {
1067 case CFG80211_BSS_FTYPE_BEACON:
1068 ies->from_beacon = true;
1069 /* fall through to assign */
1070 case CFG80211_BSS_FTYPE_UNKNOWN:
1071 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1072 break;
1073 case CFG80211_BSS_FTYPE_PRESP:
1074 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1075 break;
1076 }
Johannes Berg9caf0362012-11-29 01:25:20 +01001077 rcu_assign_pointer(tmp.pub.ies, ies);
Jussi Kivilinna06aa7af2009-03-26 23:40:09 +02001078
Dmitry Shmidt6e19bc42015-10-07 11:32:53 +02001079 signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
Emmanuel Grumbach67af9812014-05-18 10:15:24 +03001080 wiphy->max_adj_channel_rssi_comp;
1081 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
Jussi Kivilinna06aa7af2009-03-26 23:40:09 +02001082 if (!res)
1083 return NULL;
1084
Johannes Berg57fbcce2016-04-12 15:56:15 +02001085 if (channel->band == NL80211_BAND_60GHZ) {
Dedy Lansky6eb18132015-02-08 15:52:03 +02001086 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1087 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1088 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1089 regulatory_hint_found_beacon(wiphy, channel, gfp);
1090 } else {
1091 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1092 regulatory_hint_found_beacon(wiphy, channel, gfp);
1093 }
Jussi Kivilinna06aa7af2009-03-26 23:40:09 +02001094
Beni Lev4ee3e062012-08-27 12:49:39 +03001095 trace_cfg80211_return_bss(&res->pub);
Jussi Kivilinna06aa7af2009-03-26 23:40:09 +02001096 /* cfg80211_bss_update gives us a referenced result */
1097 return &res->pub;
1098}
Dmitry Shmidt6e19bc42015-10-07 11:32:53 +02001099EXPORT_SYMBOL(cfg80211_inform_bss_data);
Jussi Kivilinna06aa7af2009-03-26 23:40:09 +02001100
Dmitry Shmidt6e19bc42015-10-07 11:32:53 +02001101/* cfg80211_inform_bss_width_frame helper */
Johannes Berg2a519312009-02-10 21:25:55 +01001102struct cfg80211_bss *
Dmitry Shmidt6e19bc42015-10-07 11:32:53 +02001103cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
1104 struct cfg80211_inform_bss *data,
1105 struct ieee80211_mgmt *mgmt, size_t len,
1106 gfp_t gfp)
1107
Johannes Berg2a519312009-02-10 21:25:55 +01001108{
Johannes Berg9caf0362012-11-29 01:25:20 +01001109 struct cfg80211_internal_bss tmp = {}, *res;
1110 struct cfg80211_bss_ies *ies;
Emmanuel Grumbach3afc2162014-03-04 16:50:13 +02001111 struct ieee80211_channel *channel;
Emmanuel Grumbach67af9812014-05-18 10:15:24 +03001112 bool signal_valid;
Johannes Berg2a519312009-02-10 21:25:55 +01001113 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1114 u.probe_resp.variable);
Dedy Lansky6eb18132015-02-08 15:52:03 +02001115 int bss_type;
Mariusz Kozlowskibef9bac2011-03-26 19:26:55 +01001116
Johannes Berg0172bb72012-11-23 14:23:30 +01001117 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
1118 offsetof(struct ieee80211_mgmt, u.beacon.variable));
1119
Dmitry Shmidt6e19bc42015-10-07 11:32:53 +02001120 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
Beni Lev4ee3e062012-08-27 12:49:39 +03001121
Mariusz Kozlowskibef9bac2011-03-26 19:26:55 +01001122 if (WARN_ON(!mgmt))
1123 return NULL;
1124
1125 if (WARN_ON(!wiphy))
1126 return NULL;
Johannes Berg2a519312009-02-10 21:25:55 +01001127
Sujith22fe88d2010-05-13 10:34:08 +05301128 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
Dmitry Shmidt6e19bc42015-10-07 11:32:53 +02001129 (data->signal < 0 || data->signal > 100)))
Johannes Berg2a519312009-02-10 21:25:55 +01001130 return NULL;
1131
Mariusz Kozlowskibef9bac2011-03-26 19:26:55 +01001132 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
Johannes Berg2a519312009-02-10 21:25:55 +01001133 return NULL;
1134
Johannes Berg0172bb72012-11-23 14:23:30 +01001135 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
Dmitry Shmidt6e19bc42015-10-07 11:32:53 +02001136 ielen, data->chan);
Johannes Berg0172bb72012-11-23 14:23:30 +01001137 if (!channel)
1138 return NULL;
1139
Johannes Berg0e227082014-08-12 20:34:30 +02001140 ies = kzalloc(sizeof(*ies) + ielen, gfp);
Johannes Berg9caf0362012-11-29 01:25:20 +01001141 if (!ies)
Johannes Berg2a519312009-02-10 21:25:55 +01001142 return NULL;
Johannes Berg9caf0362012-11-29 01:25:20 +01001143 ies->len = ielen;
Johannes Berg8cef2c92013-02-05 16:54:31 +01001144 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
Johannes Berg0e227082014-08-12 20:34:30 +02001145 ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
Johannes Berg9caf0362012-11-29 01:25:20 +01001146 memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
Johannes Berg2a519312009-02-10 21:25:55 +01001147
Johannes Berg9caf0362012-11-29 01:25:20 +01001148 if (ieee80211_is_probe_resp(mgmt->frame_control))
1149 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1150 else
1151 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1152 rcu_assign_pointer(tmp.pub.ies, ies);
1153
1154 memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
1155 tmp.pub.channel = channel;
Dmitry Shmidt6e19bc42015-10-07 11:32:53 +02001156 tmp.pub.scan_width = data->scan_width;
1157 tmp.pub.signal = data->signal;
Johannes Berg9caf0362012-11-29 01:25:20 +01001158 tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
1159 tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
Dmitry Shmidt6e19bc42015-10-07 11:32:53 +02001160 tmp.ts_boottime = data->boottime_ns;
Avraham Stern1d762502016-07-05 17:10:13 +03001161 tmp.parent_tsf = data->parent_tsf;
Sunil Dutt0c868482017-12-13 19:51:36 +02001162 tmp.pub.chains = data->chains;
1163 memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
Avraham Stern1d762502016-07-05 17:10:13 +03001164 ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
Johannes Berg2a519312009-02-10 21:25:55 +01001165
Dmitry Shmidt6e19bc42015-10-07 11:32:53 +02001166 signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
Emmanuel Grumbach67af9812014-05-18 10:15:24 +03001167 wiphy->max_adj_channel_rssi_comp;
1168 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
Johannes Berg2a519312009-02-10 21:25:55 +01001169 if (!res)
1170 return NULL;
1171
Johannes Berg57fbcce2016-04-12 15:56:15 +02001172 if (channel->band == NL80211_BAND_60GHZ) {
Dedy Lansky6eb18132015-02-08 15:52:03 +02001173 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1174 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1175 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1176 regulatory_hint_found_beacon(wiphy, channel, gfp);
1177 } else {
1178 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1179 regulatory_hint_found_beacon(wiphy, channel, gfp);
1180 }
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -05001181
Beni Lev4ee3e062012-08-27 12:49:39 +03001182 trace_cfg80211_return_bss(&res->pub);
Johannes Berg2a519312009-02-10 21:25:55 +01001183 /* cfg80211_bss_update gives us a referenced result */
1184 return &res->pub;
1185}
Dmitry Shmidt6e19bc42015-10-07 11:32:53 +02001186EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
Johannes Berg2a519312009-02-10 21:25:55 +01001187
Johannes Berg5b112d32013-02-01 01:49:58 +01001188void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
Johannes Berg4c0c0b72012-01-20 13:55:26 +01001189{
Zhao, Gangf26cbf42014-04-21 12:53:03 +08001190 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
Johannes Berg4c0c0b72012-01-20 13:55:26 +01001191 struct cfg80211_internal_bss *bss;
1192
1193 if (!pub)
1194 return;
1195
1196 bss = container_of(pub, struct cfg80211_internal_bss, pub);
Johannes Berg776b3582013-02-01 02:06:18 +01001197
Zhao, Gang1b8ec872014-04-21 12:53:02 +08001198 spin_lock_bh(&rdev->bss_lock);
1199 bss_ref_get(rdev, bss);
1200 spin_unlock_bh(&rdev->bss_lock);
Johannes Berg4c0c0b72012-01-20 13:55:26 +01001201}
1202EXPORT_SYMBOL(cfg80211_ref_bss);
1203
Johannes Berg5b112d32013-02-01 01:49:58 +01001204void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
Johannes Berg2a519312009-02-10 21:25:55 +01001205{
Zhao, Gangf26cbf42014-04-21 12:53:03 +08001206 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
Johannes Berg2a519312009-02-10 21:25:55 +01001207 struct cfg80211_internal_bss *bss;
1208
1209 if (!pub)
1210 return;
1211
1212 bss = container_of(pub, struct cfg80211_internal_bss, pub);
Johannes Berg776b3582013-02-01 02:06:18 +01001213
Zhao, Gang1b8ec872014-04-21 12:53:02 +08001214 spin_lock_bh(&rdev->bss_lock);
1215 bss_ref_put(rdev, bss);
1216 spin_unlock_bh(&rdev->bss_lock);
Johannes Berg2a519312009-02-10 21:25:55 +01001217}
1218EXPORT_SYMBOL(cfg80211_put_bss);
1219
Johannes Bergd491af12009-02-10 21:25:58 +01001220void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1221{
Zhao, Gangf26cbf42014-04-21 12:53:03 +08001222 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
Johannes Bergd491af12009-02-10 21:25:58 +01001223 struct cfg80211_internal_bss *bss;
1224
1225 if (WARN_ON(!pub))
1226 return;
1227
1228 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1229
Zhao, Gang1b8ec872014-04-21 12:53:02 +08001230 spin_lock_bh(&rdev->bss_lock);
Johannes Berg32073902010-10-06 21:18:04 +02001231 if (!list_empty(&bss->list)) {
Zhao, Gang1b8ec872014-04-21 12:53:02 +08001232 if (__cfg80211_unlink_bss(rdev, bss))
1233 rdev->bss_generation++;
Johannes Berg32073902010-10-06 21:18:04 +02001234 }
Zhao, Gang1b8ec872014-04-21 12:53:02 +08001235 spin_unlock_bh(&rdev->bss_lock);
Johannes Bergd491af12009-02-10 21:25:58 +01001236}
1237EXPORT_SYMBOL(cfg80211_unlink_bss);
1238
Johannes Berg3d23e342009-09-29 23:27:28 +02001239#ifdef CONFIG_CFG80211_WEXT
Johannes Berg9f419f32013-05-08 21:34:22 +02001240static struct cfg80211_registered_device *
1241cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
1242{
Johannes Berg5fe231e2013-05-08 21:45:15 +02001243 struct cfg80211_registered_device *rdev;
Johannes Berg9f419f32013-05-08 21:34:22 +02001244 struct net_device *dev;
1245
Johannes Berg5fe231e2013-05-08 21:45:15 +02001246 ASSERT_RTNL();
1247
Johannes Berg9f419f32013-05-08 21:34:22 +02001248 dev = dev_get_by_index(net, ifindex);
1249 if (!dev)
Johannes Berg5fe231e2013-05-08 21:45:15 +02001250 return ERR_PTR(-ENODEV);
1251 if (dev->ieee80211_ptr)
Zhao, Gangf26cbf42014-04-21 12:53:03 +08001252 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
Johannes Berg5fe231e2013-05-08 21:45:15 +02001253 else
Johannes Berg9f419f32013-05-08 21:34:22 +02001254 rdev = ERR_PTR(-ENODEV);
1255 dev_put(dev);
Johannes Berg9f419f32013-05-08 21:34:22 +02001256 return rdev;
1257}
1258
Johannes Berg2a519312009-02-10 21:25:55 +01001259int cfg80211_wext_siwscan(struct net_device *dev,
1260 struct iw_request_info *info,
1261 union iwreq_data *wrqu, char *extra)
1262{
1263 struct cfg80211_registered_device *rdev;
1264 struct wiphy *wiphy;
1265 struct iw_scan_req *wreq = NULL;
Johannes Berg65486c82009-12-23 15:33:35 +01001266 struct cfg80211_scan_request *creq = NULL;
Johannes Berg2a519312009-02-10 21:25:55 +01001267 int i, err, n_channels = 0;
Johannes Berg57fbcce2016-04-12 15:56:15 +02001268 enum nl80211_band band;
Johannes Berg2a519312009-02-10 21:25:55 +01001269
1270 if (!netif_running(dev))
1271 return -ENETDOWN;
1272
Holger Schurigb2e3abd2009-09-09 13:09:54 +02001273 if (wrqu->data.length == sizeof(struct iw_scan_req))
1274 wreq = (struct iw_scan_req *)extra;
1275
Johannes Berg463d0182009-07-14 00:33:35 +02001276 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
Johannes Berg2a519312009-02-10 21:25:55 +01001277
1278 if (IS_ERR(rdev))
1279 return PTR_ERR(rdev);
1280
Johannes Bergf9d15d12014-01-22 11:14:19 +02001281 if (rdev->scan_req || rdev->scan_msg) {
Johannes Berg2a519312009-02-10 21:25:55 +01001282 err = -EBUSY;
1283 goto out;
1284 }
1285
1286 wiphy = &rdev->wiphy;
1287
Holger Schurigb2e3abd2009-09-09 13:09:54 +02001288 /* Determine number of channels, needed to allocate creq */
1289 if (wreq && wreq->num_channels)
1290 n_channels = wreq->num_channels;
Ilan Peerbdfbec22014-01-09 11:37:23 +02001291 else
1292 n_channels = ieee80211_get_num_supported_channels(wiphy);
Johannes Berg2a519312009-02-10 21:25:55 +01001293
1294 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
1295 n_channels * sizeof(void *),
1296 GFP_ATOMIC);
1297 if (!creq) {
1298 err = -ENOMEM;
1299 goto out;
1300 }
1301
1302 creq->wiphy = wiphy;
Johannes Bergfd014282012-06-18 19:17:03 +02001303 creq->wdev = dev->ieee80211_ptr;
Johannes Berg5ba63532009-08-07 17:54:07 +02001304 /* SSIDs come after channels */
1305 creq->ssids = (void *)&creq->channels[n_channels];
Johannes Berg2a519312009-02-10 21:25:55 +01001306 creq->n_channels = n_channels;
1307 creq->n_ssids = 1;
Sam Leffler15d60302012-10-11 21:03:34 -07001308 creq->scan_start = jiffies;
Johannes Berg2a519312009-02-10 21:25:55 +01001309
Holger Schurigb2e3abd2009-09-09 13:09:54 +02001310 /* translate "Scan on frequencies" request */
Johannes Berg2a519312009-02-10 21:25:55 +01001311 i = 0;
Johannes Berg57fbcce2016-04-12 15:56:15 +02001312 for (band = 0; band < NUM_NL80211_BANDS; band++) {
Johannes Berg2a519312009-02-10 21:25:55 +01001313 int j;
Johannes Berg584991d2009-11-02 13:32:03 +01001314
Johannes Berg2a519312009-02-10 21:25:55 +01001315 if (!wiphy->bands[band])
1316 continue;
Johannes Berg584991d2009-11-02 13:32:03 +01001317
Johannes Berg2a519312009-02-10 21:25:55 +01001318 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
Johannes Berg584991d2009-11-02 13:32:03 +01001319 /* ignore disabled channels */
1320 if (wiphy->bands[band]->channels[j].flags &
1321 IEEE80211_CHAN_DISABLED)
1322 continue;
Holger Schurigb2e3abd2009-09-09 13:09:54 +02001323
1324 /* If we have a wireless request structure and the
1325 * wireless request specifies frequencies, then search
1326 * for the matching hardware channel.
1327 */
1328 if (wreq && wreq->num_channels) {
1329 int k;
1330 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
1331 for (k = 0; k < wreq->num_channels; k++) {
Zhao, Gang96998e32014-04-09 09:28:06 +08001332 struct iw_freq *freq =
1333 &wreq->channel_list[k];
1334 int wext_freq =
1335 cfg80211_wext_freq(freq);
1336
Holger Schurigb2e3abd2009-09-09 13:09:54 +02001337 if (wext_freq == wiphy_freq)
1338 goto wext_freq_found;
1339 }
1340 goto wext_freq_not_found;
1341 }
1342
1343 wext_freq_found:
Johannes Berg2a519312009-02-10 21:25:55 +01001344 creq->channels[i] = &wiphy->bands[band]->channels[j];
1345 i++;
Holger Schurigb2e3abd2009-09-09 13:09:54 +02001346 wext_freq_not_found: ;
Johannes Berg2a519312009-02-10 21:25:55 +01001347 }
1348 }
Holger Schurig8862dc52009-09-11 10:13:55 +02001349 /* No channels found? */
1350 if (!i) {
1351 err = -EINVAL;
1352 goto out;
1353 }
Johannes Berg2a519312009-02-10 21:25:55 +01001354
Holger Schurigb2e3abd2009-09-09 13:09:54 +02001355 /* Set real number of channels specified in creq->channels[] */
1356 creq->n_channels = i;
Johannes Berg2a519312009-02-10 21:25:55 +01001357
Holger Schurigb2e3abd2009-09-09 13:09:54 +02001358 /* translate "Scan for SSID" request */
1359 if (wreq) {
Johannes Berg2a519312009-02-10 21:25:55 +01001360 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
Johannes Berg65486c82009-12-23 15:33:35 +01001361 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
1362 err = -EINVAL;
1363 goto out;
1364 }
Johannes Berg2a519312009-02-10 21:25:55 +01001365 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
1366 creq->ssids[0].ssid_len = wreq->essid_len;
1367 }
1368 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
1369 creq->n_ssids = 0;
1370 }
1371
Johannes Berg57fbcce2016-04-12 15:56:15 +02001372 for (i = 0; i < NUM_NL80211_BANDS; i++)
Johannes Berga401d2b2011-07-20 00:52:16 +02001373 if (wiphy->bands[i])
1374 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
Johannes Berg34850ab2011-07-18 18:08:35 +02001375
Jouni Malinen818965d2016-02-26 22:12:47 +02001376 eth_broadcast_addr(creq->bssid);
1377
Johannes Berg2a519312009-02-10 21:25:55 +01001378 rdev->scan_req = creq;
Hila Gonene35e4d22012-06-27 17:19:42 +03001379 err = rdev_scan(rdev, creq);
Johannes Berg2a519312009-02-10 21:25:55 +01001380 if (err) {
1381 rdev->scan_req = NULL;
Johannes Berg65486c82009-12-23 15:33:35 +01001382 /* creq will be freed below */
Johannes Berg463d0182009-07-14 00:33:35 +02001383 } else {
Johannes Bergfd014282012-06-18 19:17:03 +02001384 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
Johannes Berg65486c82009-12-23 15:33:35 +01001385 /* creq now owned by driver */
1386 creq = NULL;
Johannes Berg463d0182009-07-14 00:33:35 +02001387 dev_hold(dev);
1388 }
Johannes Berg2a519312009-02-10 21:25:55 +01001389 out:
Johannes Berg65486c82009-12-23 15:33:35 +01001390 kfree(creq);
Johannes Berg2a519312009-02-10 21:25:55 +01001391 return err;
1392}
Johannes Berg2afe38d2015-01-06 14:00:53 +01001393EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
Johannes Berg2a519312009-02-10 21:25:55 +01001394
James Minor76a70e92015-02-24 12:58:20 -06001395static char *ieee80211_scan_add_ies(struct iw_request_info *info,
1396 const struct cfg80211_bss_ies *ies,
1397 char *current_ev, char *end_buf)
Johannes Berg2a519312009-02-10 21:25:55 +01001398{
Johannes Berg9caf0362012-11-29 01:25:20 +01001399 const u8 *pos, *end, *next;
Johannes Berg2a519312009-02-10 21:25:55 +01001400 struct iw_event iwe;
1401
Johannes Berg9caf0362012-11-29 01:25:20 +01001402 if (!ies)
James Minor76a70e92015-02-24 12:58:20 -06001403 return current_ev;
Johannes Berg2a519312009-02-10 21:25:55 +01001404
1405 /*
1406 * If needed, fragment the IEs buffer (at IE boundaries) into short
1407 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
1408 */
Johannes Berg9caf0362012-11-29 01:25:20 +01001409 pos = ies->data;
1410 end = pos + ies->len;
Johannes Berg2a519312009-02-10 21:25:55 +01001411
1412 while (end - pos > IW_GENERIC_IE_MAX) {
1413 next = pos + 2 + pos[1];
1414 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
1415 next = next + 2 + next[1];
1416
1417 memset(&iwe, 0, sizeof(iwe));
1418 iwe.cmd = IWEVGENIE;
1419 iwe.u.data.length = next - pos;
James Minor76a70e92015-02-24 12:58:20 -06001420 current_ev = iwe_stream_add_point_check(info, current_ev,
1421 end_buf, &iwe,
1422 (void *)pos);
1423 if (IS_ERR(current_ev))
1424 return current_ev;
Johannes Berg2a519312009-02-10 21:25:55 +01001425 pos = next;
1426 }
1427
1428 if (end > pos) {
1429 memset(&iwe, 0, sizeof(iwe));
1430 iwe.cmd = IWEVGENIE;
1431 iwe.u.data.length = end - pos;
James Minor76a70e92015-02-24 12:58:20 -06001432 current_ev = iwe_stream_add_point_check(info, current_ev,
1433 end_buf, &iwe,
1434 (void *)pos);
1435 if (IS_ERR(current_ev))
1436 return current_ev;
Johannes Berg2a519312009-02-10 21:25:55 +01001437 }
James Minor76a70e92015-02-24 12:58:20 -06001438
1439 return current_ev;
Johannes Berg2a519312009-02-10 21:25:55 +01001440}
1441
Johannes Berg2a519312009-02-10 21:25:55 +01001442static char *
Johannes Berg77965c92009-02-18 18:45:06 +01001443ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
1444 struct cfg80211_internal_bss *bss, char *current_ev,
1445 char *end_buf)
Johannes Berg2a519312009-02-10 21:25:55 +01001446{
Johannes Berg9caf0362012-11-29 01:25:20 +01001447 const struct cfg80211_bss_ies *ies;
Johannes Berg2a519312009-02-10 21:25:55 +01001448 struct iw_event iwe;
Johannes Berg9caf0362012-11-29 01:25:20 +01001449 const u8 *ie;
James Minor76a70e92015-02-24 12:58:20 -06001450 u8 buf[50];
1451 u8 *cfg, *p, *tmp;
Johannes Berg9caf0362012-11-29 01:25:20 +01001452 int rem, i, sig;
Johannes Berg2a519312009-02-10 21:25:55 +01001453 bool ismesh = false;
1454
1455 memset(&iwe, 0, sizeof(iwe));
1456 iwe.cmd = SIOCGIWAP;
1457 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1458 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
James Minor76a70e92015-02-24 12:58:20 -06001459 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
1460 IW_EV_ADDR_LEN);
1461 if (IS_ERR(current_ev))
1462 return current_ev;
Johannes Berg2a519312009-02-10 21:25:55 +01001463
1464 memset(&iwe, 0, sizeof(iwe));
1465 iwe.cmd = SIOCGIWFREQ;
1466 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
1467 iwe.u.freq.e = 0;
James Minor76a70e92015-02-24 12:58:20 -06001468 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
1469 IW_EV_FREQ_LEN);
1470 if (IS_ERR(current_ev))
1471 return current_ev;
Johannes Berg2a519312009-02-10 21:25:55 +01001472
1473 memset(&iwe, 0, sizeof(iwe));
1474 iwe.cmd = SIOCGIWFREQ;
1475 iwe.u.freq.m = bss->pub.channel->center_freq;
1476 iwe.u.freq.e = 6;
James Minor76a70e92015-02-24 12:58:20 -06001477 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
1478 IW_EV_FREQ_LEN);
1479 if (IS_ERR(current_ev))
1480 return current_ev;
Johannes Berg2a519312009-02-10 21:25:55 +01001481
Johannes Berg77965c92009-02-18 18:45:06 +01001482 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
Johannes Berg2a519312009-02-10 21:25:55 +01001483 memset(&iwe, 0, sizeof(iwe));
1484 iwe.cmd = IWEVQUAL;
1485 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1486 IW_QUAL_NOISE_INVALID |
Johannes Berga77b8552009-02-18 18:27:22 +01001487 IW_QUAL_QUAL_UPDATED;
Johannes Berg77965c92009-02-18 18:45:06 +01001488 switch (wiphy->signal_type) {
Johannes Berg2a519312009-02-10 21:25:55 +01001489 case CFG80211_SIGNAL_TYPE_MBM:
Johannes Berga77b8552009-02-18 18:27:22 +01001490 sig = bss->pub.signal / 100;
1491 iwe.u.qual.level = sig;
Johannes Berg2a519312009-02-10 21:25:55 +01001492 iwe.u.qual.updated |= IW_QUAL_DBM;
Johannes Berga77b8552009-02-18 18:27:22 +01001493 if (sig < -110) /* rather bad */
1494 sig = -110;
1495 else if (sig > -40) /* perfect */
1496 sig = -40;
1497 /* will give a range of 0 .. 70 */
1498 iwe.u.qual.qual = sig + 110;
Johannes Berg2a519312009-02-10 21:25:55 +01001499 break;
1500 case CFG80211_SIGNAL_TYPE_UNSPEC:
1501 iwe.u.qual.level = bss->pub.signal;
Johannes Berga77b8552009-02-18 18:27:22 +01001502 /* will give range 0 .. 100 */
1503 iwe.u.qual.qual = bss->pub.signal;
Johannes Berg2a519312009-02-10 21:25:55 +01001504 break;
1505 default:
1506 /* not reached */
1507 break;
1508 }
James Minor76a70e92015-02-24 12:58:20 -06001509 current_ev = iwe_stream_add_event_check(info, current_ev,
1510 end_buf, &iwe,
1511 IW_EV_QUAL_LEN);
1512 if (IS_ERR(current_ev))
1513 return current_ev;
Johannes Berg2a519312009-02-10 21:25:55 +01001514 }
1515
1516 memset(&iwe, 0, sizeof(iwe));
1517 iwe.cmd = SIOCGIWENCODE;
1518 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1519 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1520 else
1521 iwe.u.data.flags = IW_ENCODE_DISABLED;
1522 iwe.u.data.length = 0;
James Minor76a70e92015-02-24 12:58:20 -06001523 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
1524 &iwe, "");
1525 if (IS_ERR(current_ev))
1526 return current_ev;
Johannes Berg2a519312009-02-10 21:25:55 +01001527
Johannes Berg9caf0362012-11-29 01:25:20 +01001528 rcu_read_lock();
1529 ies = rcu_dereference(bss->pub.ies);
Johannes Berg83c7aa12013-02-05 16:51:29 +01001530 rem = ies->len;
1531 ie = ies->data;
Johannes Berg9caf0362012-11-29 01:25:20 +01001532
Johannes Berg83c7aa12013-02-05 16:51:29 +01001533 while (rem >= 2) {
Johannes Berg2a519312009-02-10 21:25:55 +01001534 /* invalid data */
1535 if (ie[1] > rem - 2)
1536 break;
1537
1538 switch (ie[0]) {
1539 case WLAN_EID_SSID:
1540 memset(&iwe, 0, sizeof(iwe));
1541 iwe.cmd = SIOCGIWESSID;
1542 iwe.u.data.length = ie[1];
1543 iwe.u.data.flags = 1;
James Minor76a70e92015-02-24 12:58:20 -06001544 current_ev = iwe_stream_add_point_check(info,
1545 current_ev,
1546 end_buf, &iwe,
1547 (u8 *)ie + 2);
1548 if (IS_ERR(current_ev))
1549 goto unlock;
Johannes Berg2a519312009-02-10 21:25:55 +01001550 break;
1551 case WLAN_EID_MESH_ID:
1552 memset(&iwe, 0, sizeof(iwe));
1553 iwe.cmd = SIOCGIWESSID;
1554 iwe.u.data.length = ie[1];
1555 iwe.u.data.flags = 1;
James Minor76a70e92015-02-24 12:58:20 -06001556 current_ev = iwe_stream_add_point_check(info,
1557 current_ev,
1558 end_buf, &iwe,
1559 (u8 *)ie + 2);
1560 if (IS_ERR(current_ev))
1561 goto unlock;
Johannes Berg2a519312009-02-10 21:25:55 +01001562 break;
1563 case WLAN_EID_MESH_CONFIG:
1564 ismesh = true;
Rui Paulo136cfa22009-11-18 18:40:00 +00001565 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
Johannes Berg2a519312009-02-10 21:25:55 +01001566 break;
Johannes Berg9caf0362012-11-29 01:25:20 +01001567 cfg = (u8 *)ie + 2;
Johannes Berg2a519312009-02-10 21:25:55 +01001568 memset(&iwe, 0, sizeof(iwe));
1569 iwe.cmd = IWEVCUSTOM;
Rui Paulo76aa5e72009-11-18 18:22:59 +00001570 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1571 "0x%02X", cfg[0]);
Johannes Berg2a519312009-02-10 21:25:55 +01001572 iwe.u.data.length = strlen(buf);
James Minor76a70e92015-02-24 12:58:20 -06001573 current_ev = iwe_stream_add_point_check(info,
1574 current_ev,
1575 end_buf,
1576 &iwe, buf);
1577 if (IS_ERR(current_ev))
1578 goto unlock;
Rui Paulo76aa5e72009-11-18 18:22:59 +00001579 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1580 cfg[1]);
Johannes Berg2a519312009-02-10 21:25:55 +01001581 iwe.u.data.length = strlen(buf);
James Minor76a70e92015-02-24 12:58:20 -06001582 current_ev = iwe_stream_add_point_check(info,
1583 current_ev,
1584 end_buf,
1585 &iwe, buf);
1586 if (IS_ERR(current_ev))
1587 goto unlock;
Rui Paulo76aa5e72009-11-18 18:22:59 +00001588 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1589 cfg[2]);
Johannes Berg2a519312009-02-10 21:25:55 +01001590 iwe.u.data.length = strlen(buf);
James Minor76a70e92015-02-24 12:58:20 -06001591 current_ev = iwe_stream_add_point_check(info,
1592 current_ev,
1593 end_buf,
1594 &iwe, buf);
1595 if (IS_ERR(current_ev))
1596 goto unlock;
Rui Paulo76aa5e72009-11-18 18:22:59 +00001597 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
Johannes Berg2a519312009-02-10 21:25:55 +01001598 iwe.u.data.length = strlen(buf);
James Minor76a70e92015-02-24 12:58:20 -06001599 current_ev = iwe_stream_add_point_check(info,
1600 current_ev,
1601 end_buf,
1602 &iwe, buf);
1603 if (IS_ERR(current_ev))
1604 goto unlock;
Rui Paulo76aa5e72009-11-18 18:22:59 +00001605 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1606 iwe.u.data.length = strlen(buf);
James Minor76a70e92015-02-24 12:58:20 -06001607 current_ev = iwe_stream_add_point_check(info,
1608 current_ev,
1609 end_buf,
1610 &iwe, buf);
1611 if (IS_ERR(current_ev))
1612 goto unlock;
Rui Paulo76aa5e72009-11-18 18:22:59 +00001613 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1614 iwe.u.data.length = strlen(buf);
James Minor76a70e92015-02-24 12:58:20 -06001615 current_ev = iwe_stream_add_point_check(info,
1616 current_ev,
1617 end_buf,
1618 &iwe, buf);
1619 if (IS_ERR(current_ev))
1620 goto unlock;
Rui Paulo76aa5e72009-11-18 18:22:59 +00001621 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
Johannes Berg2a519312009-02-10 21:25:55 +01001622 iwe.u.data.length = strlen(buf);
James Minor76a70e92015-02-24 12:58:20 -06001623 current_ev = iwe_stream_add_point_check(info,
1624 current_ev,
1625 end_buf,
1626 &iwe, buf);
1627 if (IS_ERR(current_ev))
1628 goto unlock;
Johannes Berg2a519312009-02-10 21:25:55 +01001629 break;
1630 case WLAN_EID_SUPP_RATES:
1631 case WLAN_EID_EXT_SUPP_RATES:
1632 /* display all supported rates in readable format */
1633 p = current_ev + iwe_stream_lcp_len(info);
1634
1635 memset(&iwe, 0, sizeof(iwe));
1636 iwe.cmd = SIOCGIWRATE;
1637 /* Those two flags are ignored... */
1638 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1639
1640 for (i = 0; i < ie[1]; i++) {
1641 iwe.u.bitrate.value =
1642 ((ie[i + 2] & 0x7f) * 500000);
James Minor76a70e92015-02-24 12:58:20 -06001643 tmp = p;
Johannes Berg2a519312009-02-10 21:25:55 +01001644 p = iwe_stream_add_value(info, current_ev, p,
James Minor76a70e92015-02-24 12:58:20 -06001645 end_buf, &iwe,
1646 IW_EV_PARAM_LEN);
1647 if (p == tmp) {
1648 current_ev = ERR_PTR(-E2BIG);
1649 goto unlock;
1650 }
Johannes Berg2a519312009-02-10 21:25:55 +01001651 }
1652 current_ev = p;
1653 break;
1654 }
1655 rem -= ie[1] + 2;
1656 ie += ie[1] + 2;
1657 }
1658
Joe Perchesf64f9e72009-11-29 16:55:45 -08001659 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1660 ismesh) {
Johannes Berg2a519312009-02-10 21:25:55 +01001661 memset(&iwe, 0, sizeof(iwe));
1662 iwe.cmd = SIOCGIWMODE;
1663 if (ismesh)
1664 iwe.u.mode = IW_MODE_MESH;
1665 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1666 iwe.u.mode = IW_MODE_MASTER;
1667 else
1668 iwe.u.mode = IW_MODE_ADHOC;
James Minor76a70e92015-02-24 12:58:20 -06001669 current_ev = iwe_stream_add_event_check(info, current_ev,
1670 end_buf, &iwe,
1671 IW_EV_UINT_LEN);
1672 if (IS_ERR(current_ev))
1673 goto unlock;
Johannes Berg2a519312009-02-10 21:25:55 +01001674 }
1675
James Minor76a70e92015-02-24 12:58:20 -06001676 memset(&iwe, 0, sizeof(iwe));
1677 iwe.cmd = IWEVCUSTOM;
1678 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
1679 iwe.u.data.length = strlen(buf);
1680 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
1681 &iwe, buf);
1682 if (IS_ERR(current_ev))
1683 goto unlock;
1684 memset(&iwe, 0, sizeof(iwe));
1685 iwe.cmd = IWEVCUSTOM;
1686 sprintf(buf, " Last beacon: %ums ago",
1687 elapsed_jiffies_msecs(bss->ts));
1688 iwe.u.data.length = strlen(buf);
1689 current_ev = iwe_stream_add_point_check(info, current_ev,
1690 end_buf, &iwe, buf);
1691 if (IS_ERR(current_ev))
1692 goto unlock;
Johannes Berg2a519312009-02-10 21:25:55 +01001693
James Minor76a70e92015-02-24 12:58:20 -06001694 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
1695
1696 unlock:
Johannes Berg9caf0362012-11-29 01:25:20 +01001697 rcu_read_unlock();
Johannes Berg2a519312009-02-10 21:25:55 +01001698 return current_ev;
1699}
1700
1701
Zhao, Gang1b8ec872014-04-21 12:53:02 +08001702static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
Johannes Berg2a519312009-02-10 21:25:55 +01001703 struct iw_request_info *info,
1704 char *buf, size_t len)
1705{
1706 char *current_ev = buf;
1707 char *end_buf = buf + len;
1708 struct cfg80211_internal_bss *bss;
James Minor76a70e92015-02-24 12:58:20 -06001709 int err = 0;
Johannes Berg2a519312009-02-10 21:25:55 +01001710
Zhao, Gang1b8ec872014-04-21 12:53:02 +08001711 spin_lock_bh(&rdev->bss_lock);
1712 cfg80211_bss_expire(rdev);
Johannes Berg2a519312009-02-10 21:25:55 +01001713
Zhao, Gang1b8ec872014-04-21 12:53:02 +08001714 list_for_each_entry(bss, &rdev->bss_list, list) {
Johannes Berg2a519312009-02-10 21:25:55 +01001715 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
James Minor76a70e92015-02-24 12:58:20 -06001716 err = -E2BIG;
1717 break;
Johannes Berg2a519312009-02-10 21:25:55 +01001718 }
Zhao, Gang1b8ec872014-04-21 12:53:02 +08001719 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
Johannes Berg77965c92009-02-18 18:45:06 +01001720 current_ev, end_buf);
James Minor76a70e92015-02-24 12:58:20 -06001721 if (IS_ERR(current_ev)) {
1722 err = PTR_ERR(current_ev);
1723 break;
1724 }
Johannes Berg2a519312009-02-10 21:25:55 +01001725 }
Zhao, Gang1b8ec872014-04-21 12:53:02 +08001726 spin_unlock_bh(&rdev->bss_lock);
James Minor76a70e92015-02-24 12:58:20 -06001727
1728 if (err)
1729 return err;
Johannes Berg2a519312009-02-10 21:25:55 +01001730 return current_ev - buf;
1731}
1732
1733
1734int cfg80211_wext_giwscan(struct net_device *dev,
1735 struct iw_request_info *info,
1736 struct iw_point *data, char *extra)
1737{
1738 struct cfg80211_registered_device *rdev;
1739 int res;
1740
1741 if (!netif_running(dev))
1742 return -ENETDOWN;
1743
Johannes Berg463d0182009-07-14 00:33:35 +02001744 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
Johannes Berg2a519312009-02-10 21:25:55 +01001745
1746 if (IS_ERR(rdev))
1747 return PTR_ERR(rdev);
1748
Johannes Bergf9d15d12014-01-22 11:14:19 +02001749 if (rdev->scan_req || rdev->scan_msg)
Johannes Berg5fe231e2013-05-08 21:45:15 +02001750 return -EAGAIN;
Johannes Berg2a519312009-02-10 21:25:55 +01001751
1752 res = ieee80211_scan_results(rdev, info, extra, data->length);
1753 data->length = 0;
1754 if (res >= 0) {
1755 data->length = res;
1756 res = 0;
1757 }
1758
Johannes Berg2a519312009-02-10 21:25:55 +01001759 return res;
1760}
Johannes Berg2afe38d2015-01-06 14:00:53 +01001761EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
Johannes Berg2a519312009-02-10 21:25:55 +01001762#endif